Cooling dynamo-electric machines.



No. 727,685. PATENTED MAY 12, 1903. E. 1). PRIEST.

COOLING DYNAMO ELECTRIC MACHINES.

APPLICATION FILED NOV. 2, 1900.

N0 MODEL.

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No. 727,685. I UNITED STATES PATENT Patented May 12, 1903.

OFFICE.

EDWARD D. PRIEST, OF SOHENEOTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

COOLING DY-NAMO ELECTRlC MACHINES.

SPECIFICATION forming part of Letters Patent No. 727,685, dated May 12,1903.

Application filed November 2. 1900. Serial noisazse. (No model.)

To aZZ whom it may concern:

Be it known that I, EDWARD D. PRIEST, a citizen of the United States,residing at Schenectady, county of Schenectady, State of New York, haveinvented certainnew anduseful Improvements in Cooling Dynamo-ElectricMachines, of which the following is a specification.

My invention relates to means for cooling 1 o dynamo-electric machines,and especially railway-motors, in order to prevent overheating of thearmature or rotary member and the other parts of the motor.

It consists in devices for causing air toenter I 5 at one end of themotor, preferably the pinion end, and to pass through it to the otherend through longitudinal ducts formed in the core and radialair-passages formed in the core and the spiders on which it issupported.

This efiect is produced by an air-shield which closely embraces thepinion end of the armature, constituting an annular chambercommunicating with the ducts and air-passages in the core and spiders.Pipes or fines run 2 5 from this chamber to the outside of the motorframe or casing and admit cool air to the chamber only. At thecommutator end of the motor the frame is provided with one or moreopenings to permit the heated air to cs cape. The current of air throughthe shield and passages is produced by the centrifugal movement of theair induced in said passages by the rapidly-rotating armature.

The drawing is a longitudinal half-sectional elevation of therailway-motorembodyingmy improvements.

The head A at the pinion end of the motor extends inwardly to form abearing for the armature-shaft and has an interior cylin- 0 dricalshoulder a, on which is fitted a ring or cylinder B, extending inwardlyand closely embracing the head of the spider C. At one or more points inthe peripheral surface of the cylinder or ring there is an opening I),

5 communicating with one of the pipes or flues D, which run out radiallythrough the frame or casing E of the motor, between the fieldmagnets andthe end of said frame.

It will be seen that the head A, the ring B,

and the spider O constitute an annular chamber concentric with the shaftand communiarmature.

between the coils L from the ducts I, of which there are several runninglengthwise through the core. Passages H are formed in the spiders O O,extending outwardly from the ducts I. At the commutator end of the motorone or more passages e are made in the frame toipermit the heated air toescape.

The operation of my device is as follows: When the armature isin rapidrotation,it acts like a centrifugal blower to expel the air from thepassages H H. Inasmuch as no air can enter the passages except throughthe pipes D, the annular chamber above referred to, and the ducts I, itfollows that a current of cool air will flow in through the said pipesand chamber and out through the ducts I and passages H-H, entering thespace M, surrounding, the armature, inside the frame E, and thenceescaping through the hole e and rapidly carrying off the heat generatedin the A practical test of the invention shows that the rise intemperature of the coils, core, spools, and frame is less by from 10.5to "18 centigrade than it Would be without this device, the greatestreduction being in the coils and core,where the heating 9o effect ismost injurious. The ring B fits so closely to the end of the spider thatpractically no air can enter it from the space M, so that the air canpass throughthe core but once, and thus a continuous supply of coolair 5is insured.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is-- 1. The combination with an inclosed electric motorhaving a rotating element provided Ic o with air-passages, whereby itoperates as a centrifugal blower, said rotating element being journaledin the end of the motor-inclosure, of an inlet-opening in the side ofthe inclosure, and communications between said inlet and saidair-passages alone.

2. In an electric machine, the combination with a rotating elementprovided with cooling-passages, whereby said element operates as acentrifugal blower, of closed fines for connecting said passages withthe outside of the machine.

3. In an electric machine, the combination with a rotating elementprovided with cooling-passages, whereby it operates as a centrifugalblower, of an annular chamber communicating with said passages, andclosed fiues connecting said chamber with the outside of the machine.

4. In an electric machine, the combination with a rotating elementprovided with cooling-passages, whereby it operates as a centrifugalblower, of a closed annular chamber communicating only with saidpassages and with the outside of the machine.

5. The combination, with a motor-frame, of an armature havinglongitudinal ducts and radial air-passages through its core, a ringtightly inclosing the end of the armature, and forming with an extensionof the armature a chamber communicating with said longitudinal ducts,and pipes connecting the ring with the outside air.

6. The combination, with a motor-frame having an opening at one end andat the other end a head provided with an interior cylindrical shoulder,of a ring fittingsaid shoulder, and pipes running from said ring to theoutside of the frame.

7. The combination, with an armature having the spiders O, 0 containingair-passages H, the core F having air-ducts I and passages H, the ring Rclosely inclosing the spider O, and the pipes D extending from saidring.

8. In an electric machine, the combination with a rotating elementformed with coolingpassages, whereby it operates as a centrifugalblower, of a ring or cylinder forming with the rotating element anannular chamber communicating with said passages, and closed fluesconnecting said chamber with the outside of the machine.

9. The combination with an electric machine provided with a casing andhaving cooling-passages in its rotating element, whereby the latteroperates as a centrifugal blower, of a head closing the end of thecasing and extending inside the latter to serve as a hearing for therotating element, said cooling-passages having communication between theend of the machine and the end of the casing with the outside of thelatter.

10. The combination with an electric machine provided with a casing andhaving cooling-passages in its rotating element, whereby the latteroperates as a centrifugal blower, of a head closing the end of thecasing and extending inside the latter to serve as a bearing for therotating element, and passages connecting the outside of the casing withthe interior of the machine only through the passages in the rotatingelement.

11. The combination with an inclosed electric machine havinga rotatingelement formed with cooling-passages, whereby said element operates as acentrifugal blower, of a head forming a part of the inclosure andextending inside the inclosure to form abearing for the rotatingelement, and closed fiues connecting the said cooling-passages with theoutside of the inclosure.

12. The combination with an inclosed electric machine having itsrotating element provided with suitable cooling-openings, whereby saidelement operates as a centrifugal blower, of a head completing theinclosure and extending inside the latter to serve as a bearing for therotating element, an annular chamber communicating with said openings,said chamber having communication also between the machine and the headwith the outside of the inclosure.

13. The combination with an inclosed electric machine having a rotatingelement formed with cooling-passages, whereby said element operates as acentrifugal blower, of a head forming a part of the inclosure andextending inside the latter to form a bearing for the rotating element,and a ring forming with the head and rotating element an annular chamberwhich communicates with said coolingpassages and with the outside of theinclosure.

l t. The combination with an inclosed electric machine having a rotatingelementformed with cooling-passages, whereby the said element operatesas a centrifugal-blower, of a head completing the inclosure at one endof said element and extending inside the inclosure to form a bearing forsaid element, the inclosure being provided with a suitable inlet throughwhich air is drawn between the end of the machine and the end of theinclosure, and thence into the cooling-passages in the rotating element.

15. The combination with an inclosed electric machine havingarotatingelementformed with cooling-passages, whereby said element operates as acentrifugal blower, of a head inclosing the machine at the end andextending inside the inclosure to form a bearing for the rotatingelement, and openings in the sides of the machine-inclosure throughwhich air is drawn into the space between the machine and the head, andthence into said cooling-passages, by the rotation of said element.

16. The combination with an inclosed elec tric machine having a rotatingelement provided with cooling-passages,whereby said element operates asa centrifugal blower, of a head inclosing the machine at the end andextending inside the inclosure to form a hearing for said element, andpassages connecting the outside of the machine with the inside onlythrough said cooling-passages in the ro tating element.

17. The combination with an inclosed electric machine having a rotatingelement provided with cooling-passages,whereby said e1e ment operates asa centrifugal blower, of a head inclosing the machine at the end of saidelement and extending inside the inclosure to form a bearing for thelatter, and an annular passage which connects the outside of the machinewith said cooling-passages, said annular passage being formed byportions of the rotating element and the head.

18. In an electric machine, the combination with a rotary element formedwith ventilating-openings, of a shield closely embracing said element toprevent rentrance of heated air into said ventilating-openings, and toper-

